I find the problem is more likely that a child or shorter adult would have to crane their neck upwards more likely than not. There's a general trend to putting monitor shelves up higher on desks resulting in incorrect ergonomics--people are now looking up at monitors when their eyes should be level with the top of the screen.
Continuing that thought: I find this is exacerbated by the trend to larger displays (which I like). The 24" iMac I use at work is on a monitor shelf on a cart-style workstation. The top half of the screen is above my eye level and due to the construction of the furniture there's no way to change that. I have to nearly get out of my chair to insert or remove a DVD (which I do a lot).
My first thought upon seeing this design (other than G3/4 era design features) was the DVD slot at the top of the machine! Even with the machine at the proper height you'd have to stand up to insert/remove a disc.
